While the words “instant gratification” and “rock tumbling” may not fit in the same sentence, the hobby of rock collecting and polishing is still very satisfying. What begins as raw, unrefined rocks ...

If you’re reading Hackaday, there’s a good chance you had a rock tumbler in your younger days. Hell, we’d put odds on a few of you having one rumbling away in the background as you read this. They’re ...